Rivet fastener



FIG. 1—is a perspective view of the rivet fastener;

FIG. 2—is a side view of the rivet fastener shown in FIG. 1;

FIG. 3—is an alternative side view of the rivet fastener of FIG. 1 rotated 90° from the rivet fastener shown in FIG. 2;

FIG. 4—is a top view of the rivet fastener shown in FIG. 1; and,

FIG. 5—is a bottom view of the rivet fastener shown in FIG. 1.

The broken lines shown in the Figures are for the purpose of illustrating and form no part of the claimed design. 

I claim the ornamental design for a rivet fastener, as shown and described. 